2006 Highlander JBL > Kenwood KDC-X994

I have a 2006 Toyota Highlander with the JBL system. I have ordered a Kenwood KDC-X994. It is my intention (and the least expensive option) to use the existing JBL amplifier. I have read and seen conflicting information on the internet about what kind of wiring interface I will need. Do I need either the Metra TYTO-01 (or the similar Scocshe TA07SR) or can I use one of these items?

http://cgi.ebay.com/PREMIUM-AMP-Rad...492244092?pt=LH_DefaultDomain_0#ht_6612wt_911

http://cgi.ebay.com/PREMIUM-OEM-RAD...414504370?pt=LH_DefaultDomain_0#ht_6517wt_911

Both items are by the same seller and both say they will work with the JBL. Obviously only one will fit because the cable ends are different. Will one of these work? Which one? Do I not need the Scosche or Metra products that look similar but contain the 'black box'?

Do you have a better idea?

Thanks.